Evaluation of steroid biosynthetic lesions in isolated Leydig cells from the testes of streptozotocin-diabetic rats

Diabetologia ◽  
1982 ◽  
Vol 23 (6) ◽  
Author(s):  
N. K�hn-Velten ◽  
D. Waldenburger ◽  
W. Staib
Keyword(s):  
Leydig Cells ◽  
Diabetic Rats ◽  
Streptozotocin Diabetic Rats

scholarly journals Decreased activity of the heparan sulfate-modifying enzyme glucosaminyl N-deacetylase in hepatocytes from streptozotocin-diabetic rats

1991 ◽  
Vol 266 (14) ◽  
pp. 8671-8674
Author(s):  
E. Unger ◽  
I. Pettersson ◽  
U.J. Eriksson ◽  
U. Lindahl ◽  
L. Kjellén
Keyword(s):  
Heparan Sulfate ◽  
Diabetic Rats ◽  
Streptozotocin Diabetic Rats

scholarly journals Hydrogen Peroxide-Induced Inhibition of Vasomotor Activity: Evaluation of Single and Combined Treatments With Vitamin A and Insulin in Streptozotocin-Diabetic Rats

2002 ◽  
Vol 3 (2) ◽  
pp. 119-130 ◽  
Author(s):  
Fulya Zobali ◽  
Tanju Besler ◽  
Nuray Ari ◽  
Çimen Karasu
Keyword(s):  
Oxidative Stress ◽  
Hydrogen Peroxide ◽  
Vitamin A ◽  
Diabetic Rats ◽  
Thiobarbituric Acid Reactive Substance ◽  
Single Treatment ◽  
Combined Treatments ◽  
Retinol Metabolism ◽  
Vasomotor Activity ◽  
Streptozotocin Diabetic Rats

A positive correlation has been established between increased oxidative stress and cardiovascular diseases in diabetes mellitus. We evaluated the effects of single or combined treatments with vitamin A (retinol acetate, 30 mg/kg/day, for 12-weeks) and insulin (8-10 IU/rat/day for the final 6-week) on vasomotor activity, oxidative stress and retinol metabolism in 12-week streptozotocin diabetic rats. The vasomotor activity was determined by measuring invitroresponsiveness of aorta rings to phenylephrine (PE) and acetylcholine (ACh) in the absence or in the presence of hydrogen peroxide (H2O2). Preincubation withH2O2(10 μM) produced a significant decrease in PE (1 mM)-induced contraction in untreated-diabetic but not in control rats. Single treatment with insulin counteracted this effect ofH2O2and also reversed the increased contractile response of diabetic aorta to PE, while vitamin A was found to be ineffective.H2O2(10 μM) also inhibited ACh (1 mM)-stimulated endothelium- dependent relaxation two fold more in diabetic than in control aorta. In the prevention ofH2O2-induced inhibition of vascular relaxation to ACh, vitamin A alone was markedly effective while insulin alone was not. The combination of vitamin A plus insulin removed the inhibitory action ofH2O2in diabetic aorta. Diabetic animals displayed an increased level of aorta thiobarbituric acid reactive substance (TBARS) in association with decreased levels of plasma retinol and retinol-binding protein (RBP). Single treatment with insulin, in spite of allowing recovery of normal growth rate and improved glucose and retinol metabolism in diabetic rats, was unable to control TBARS production to the same extent as vitamin A alone. Our findings suggest that the maintenance of ACh-stimulated endothelium-dependent vasorelaxant tone in normal physiological levels depends largely on the prevention and/or inhibition of peroxidative stress, which is achieved by combined treatment with vitamin A plus insulin. The use of vitamin A together with insulin provides a better metabolic control and more benefits than use of insulin alone in the reduction of diabetes-induced vascular complications.

scholarly journals Modulation of hepatic and intestinal Glutathione S-transferases and other antioxidant enzymes by dietary lipids in streptozotocin diabetic rats

Chemosphere ◽  
1999 ◽  
Vol 38 (13) ◽  
pp. 3003-3013 ◽  
Author(s):  
M.Dolores Girón ◽  
Rafael Salto ◽  
Yolanda González ◽  
Jose A. Girón ◽  
Natalia Nieto ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Diabetic Rats ◽  
Dietary Lipids ◽  
Glutathione S Transferases ◽  
Streptozotocin Diabetic Rats
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